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Continuation of the mycological study of the fire-damaged pine forest in Kampinos National Park in central Poland in 2017 produced interesting new findings. Among the taxa collected, 36 were new to the park, six had not been hitherto reported from Poland (Calycellina araneocincta, Ciliolarina aff. laetifica, Clitocybe metachroides, Galerina cerina f. longicystis, Parasola cuniculorum, Pleonectria pinicola), and the previous status of one taxon (Pleonectria cucurbitula) had been uncertain. Short descriptions based on collected specimens have been prepared for all taxa new to Poland. The current number of taxa of macromycetes identified in Kampinos National Park has reached 1,604.

Basidiomata of Callistosporium pinicola were collected in years 2012–2013, on strongly decayed fallen trunks of Picea abies and Abies alba on two remote sites, localized in North-eastern and southern Poland. These localities represent the first records of this fungus in Poland. A full description and illustration of C. pinicola based on Polish specimens are provided and the distinguishing features and delimitation of the species are briefly discussed. The ecology of C. pinicola, its general distribution and threat are also presented. As all specimens of C. pinicola were collected only in recent years we suggest that this species is increasing its distribution in Poland. However, we cannot rule out the possibility that, because of its cryptic nature, C. pinicola has been much overlooked in the past.

The name Calocybe cerina has recently been applied for two different species of agarics. After studying collections from different European countries it is concluded that the true Calocybe cerina is very close to C. chrysenteron and best regarded as a variety. The new combination Calocybe chrysenteron var. cerina is proposed and a full description of that taxon is given. The majority of collections, identified as C. cerina, appear to belong to a fungus, provisionally described by Bon as Callistosporium luteoolivaceum fo. minor. It is described here as a new species: Callistosporium pinicola. Calocybe juncicola is another species that might be confused with the two species mentioned before and therefore a full description is provided. The status of the genera Rugosomyces and Calocybe is discussed. The new combinations Calocybe obscurata and Calocybe pudica are made.